ENS 54697
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ENS Event | |
|---|---|
01:21 Mar 9, 2020 | |
| Title | Invalid Actuation of a General Containment Isolation Signal Affecting More than One System |
| Event Description | This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a general containment isolation signal affecting more than one system. On March 8, 2020, at approximately 2021 CDT, Browns Ferry Nuclear Plant Unit 2 experienced an unexpected loss of the 2A Reactor Protection System (RPS). This resulted in Primary Containment Isolation System (PCIS) groups 2, 3, 6, and 8 isolations, and the initiation of Standby Gas Treatment Trains A and B, and Control Room Emergency Ventilation System Train A. All affected safety systems responded as expected.
Plant conditions which initiate PCIS Group 2 actuations are Reactor Vessel Low Water Level (Level 3) or High Drywell Pressure. The PCIS Group 3 actuations are initiated by Reactor Vessel Low Water Level (Level 3) or Reactor Water Cleanup Area High Temperature. The PCIS Group 6 actuations are initiated by Reactor Vessel Low Water Level (Level 3), High Drywell Pressure, or Reactor Building Ventilation Exhaust High Radiation (Reactor Zone or Refuel Zone). The PCIS Group 8 actuations are initiated by Low Reactor Vessel Water Level (Level 3) or High Drywell Pressure. At the time of the event, these conditions did not exist; therefore, the actuation of the PCIS was invalid. The RPS MG Set trip was believed to have been caused by an intermittent short across a spike suppressor, which led to a loss of generator output signal to a voltage regulator. The affected components have been replaced. There were no safety consequences or impact to the health and safety of the public as a result of this event. This event was entered into the Corrective Action Program as Condition Report 1593265. The NRC Resident Inspector has been notified of this event. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1404.83 h58.535 days <br />8.362 weeks <br />1.924 months <br />) | |
| Opened: | Allen Buckner 14:11 May 6, 2020 |
| NRC Officer: | Bethany Cecere |
| Last Updated: | May 6, 2020 |
| 54697 - NRC Website
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WEEKMONTHYEARENS 556602021-10-20T13:05:00020 October 2021 13:05:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 552872021-04-01T18:02:0001 April 2021 18:02:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 549322020-08-06T22:49:0006 August 2020 22:49:00 10 CFR 50.73(a)(1), Submit an LER | 60-Day Optional Telephonic Notification of an Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 549312020-08-06T06:28:0006 August 2020 06:28:00 10 CFR 50.73(a)(1), Submit an LER | 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation ENS 547092020-03-16T06:02:00016 March 2020 06:02:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 546972020-03-09T01:21:0009 March 2020 01:21:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 543322019-08-20T16:33:00020 August 2019 16:33:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 543002019-07-31T21:50:00031 July 2019 21:50:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification Due to an Invalid Actuation of a Containment Isolation Signal ENS 543412018-12-29T07:20:00029 December 2018 07:20:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a Signal Affecting More than One System ENS 536612018-08-16T05:00:00016 August 2018 05:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 530702017-01-10T09:00:00010 January 2017 09:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 516282015-11-06T14:15:0006 November 2015 14:15:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of an Emergency Diesel Generator ENS 510852015-04-05T09:35:0005 April 2015 09:35:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Primary Containment Isolation System Actuation ENS 507542014-11-26T20:27:00026 November 2014 20:27:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 506582014-10-07T15:35:0007 October 2014 15:35:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 505652014-08-27T16:09:00027 August 2014 16:09:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of General Containment Isolation Signals ENS 499422014-01-21T13:46:00021 January 2014 13:46:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephone Notification of an Invalid Primary Containment Isolation Signal ENS 490772013-04-09T10:06:0009 April 2013 10:06:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report of an Invalid Primary Containment System Isolation Signal ENS 486902012-11-23T10:35:00023 November 2012 10:35:00 10 CFR 50.73(a)(1), Submit an LER Primary Containment Isolation Actuation Signal During Surveillance ENS 485872012-10-18T05:01:00018 October 2012 05:01:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephone Notification of an Invalid System Actuation ENS 485682012-10-09T16:50:0009 October 2012 16:50:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of an Invalid System Actuation ENS 485062012-09-18T06:45:00018 September 2012 06:45:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Actuation of Containment Isolation Signals ENS 485052012-09-17T09:12:00017 September 2012 09:12:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Actuation of Containment Isolation Signals ENS 480822012-05-19T05:06:00019 May 2012 05:06:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 480062012-04-11T20:15:00011 April 2012 20:15:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation Resulting from Post Maintenance Testing ENS 474502011-09-19T16:00:00019 September 2011 16:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Group 6 Isolation Signal ENS 470032011-05-01T07:44:0001 May 2011 07:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid Rps (Scram) Actuation ENS 468802011-03-30T19:43:00030 March 2011 19:43:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Rps Signal Due to Loss of Variable Leg of Level Transmitter ENS 468812011-03-27T01:05:00027 March 2011 01:05:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Primary Containment Isolation Signal Due to Maintenance ENS 466562011-01-03T21:15:0003 January 2011 21:15:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Telephone Notificaton Concerning Invalid Containment Isolation System Actuations ENS 460662010-07-02T17:32:0002 July 2010 17:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation from a Loss of Power to the Reactor Protection System (Rps) 3A ENS 460542010-04-30T21:48:00030 April 2010 21:48:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation from a Loss-Of-Power to Reactor Protection System (Rps) 1A ENS 460462010-04-27T22:37:00027 April 2010 22:37:00 10 CFR 50.73(a)(1), Submit an LER Invalid Group 6 Containment Isolation ENS 442942008-04-14T18:08:00014 April 2008 18:08:00 10 CFR 50.73(a)(1), Submit an LER Inadvertant Deenergization of Group Six Logic Circuit ENS 430832006-11-10T06:10:00010 November 2006 06:10:00 10 CFR 50.73(a)(1), Submit an LER Edg Actuation Due to Accidental Switch Mispositioning ENS 428782006-08-20T01:02:00020 August 2006 01:02:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation ENS 428772006-08-19T00:58:00019 August 2006 00:58:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation ENS 428672006-08-09T14:51:0009 August 2006 14:51:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eecw Pump Actuation During Testing ENS 428372006-07-18T09:47:00018 July 2006 09:47:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to Loss of Power to One Reactor Protection System Bus ENS 423892006-01-13T17:57:00013 January 2006 17:57:00 10 CFR 50.73(a)(1), Submit an LER Unplanned, Invalid Actuation of Emergency Diesel Generator ENS 422152005-11-15T14:05:00015 November 2005 14:05:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation ENS 411812004-09-28T18:02:00028 September 2004 18:02:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation from Loss-Of-Power to Reactor Protection System (Rps) Bus 2A ENS 411802004-09-25T23:14:00025 September 2004 23:14:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation from Loss-Of-Power to Reactor Protection System (Rps) Bus 3B 2021-04-01T18:02:00 [Table view] | |
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